Shock-absorber.



A L McGREGOR,

v SHOCK ABSORBER.

APPLICATION man 02020, 1916.

Patented Spt. 24,1918,

'- which laterally extend side plates 6 unrestone ALI-AN L. EVIGGrB-EGQR, F CHICAGO, ILLINOIS.

SHOCK-ABSORBER.

minim-mun Specification of Letters Patent.

Patented Sept. 24, 1918.

Application filed December 20, 1936. Serial No. 137,932.

There are a great many devices on the market intended for this purpose but they are more or less complicated. and expensive. The ob ect of my invention 15 to provide a simple, inexpensive and reliable device which will efiectively and eilicientlyprevent sud den and violent separation between spring members or between the vehicle frame and the springs and Willfvll'Wlll gradually absorb the forces occasioned by the tendency or" such separation.

On the-accompanying; drawing I disclose a device embodying the various features of my invention. On the drztwing- Figure 1 is a side elevetionzil view of the device applied to e vehicle frame and aide part of the device frame-Work being shown in section,

Fig. 2 is a plan view, and

Fig. 3 is e sectional view on plane 3-3,

.he device body is of general circular or elliptic shape and comprises a drum 5 from and 7 for supporting upper and lower pins 8 and 9 on which rollers 10 end 11 are journa led between the plates. Located diametrally in the drum and in horizontal position, as Sl'l0'l l'l 'lS the barrel 12 for the compression spring 13, tlio'barrel, drum and roller supporting plates being preferably part of an integral casting. The spring encircles a rod 14: which extends into the barrel through the opening 15 in the outer abutment Wall 16, the spring being confined. between. the Wall and the lib-utmimt WilSilQl' 17 held on the inner end of the ted by the nuts 18. The outer end of the rod is detschebly secured to a strap or belt 19 of suitable ma teriel, which strap passes around tic' lower roller 11, then around the drum 5, then over the top roller 10. Below the spring barrel. are two transversely extending lugs 20 and 21 for bolts 22 and 23 by means of which a bracket 24c is secured to the device framework, thls bracket having a. slot 25 for re ceiving one. of the flanges 01' the side beam 260i the vehicle frame, set screws 27 detuchably securing the bracket to the vehicle frame and supporting the ebsorbing device in vertical position at the vehicle side above the vehicle axle 28, e similar absorbing device being placed at the opposite side of the vehicle. After the belt or strap 19 passes over the top roller 10 it extends downwardly and terminates in a loop 29 which receives the axle. To hold the strap to the drum retcining flanges 30 and 31 are connected by cross-pieces 32.

hen the shock absorber devices are applied to u vehicle the straps are preferably given a primary tension sufficient to keepthe strap taut during travel of the vehicle over ordinary road-Way conditions. Should the vehicle Wheels travel over a deep rut or depression an dtend to suddenly carry the axle away from the body and spread the springs,

this will be prevented by the inertia of the frictional engagement of the belts with the drums and rollers and then, when after such drop of the and vehicle frame, the frame tends to suddenly rebound, the same inertia will prevent such rebound but Hills such first-jerk on the straps, the straps Wlll gradually slip on the drums and will pull against the springslB which together with the greatly lessened frictional resistance of the straps will gradually check and absorb $0 the force and will prevent overthrow of the springs and abnormal. separation between the vehicle frame and axle, that 1s, the frame cud axle will be gradually restored to normal relative position without shock to the 96 vehicle Thus any sudden or violent abnor-- mal separation betwcen'the vehicle body and axis is snubbed end the forces distributed and absorbed by the absorbing devices.

The absorbing device oi my invention is 100 of very siu'iple and inexpensive construction, the entire body including the drum, roller supports and springtbarrel being of a single piece oi'inetel and can-be readily formed by :esting. The device can be applied in diiierent positions to the vehicle. in the arrnngenient shown in Fig. 1, the belt guard rollers are at the side .and the belt after leaving the top roller is shown passing over the turn of the belt around the lower roller.

This introduces additional friction by the engagement of the belt sections with each,

provided and 70 y l a friction drum, a Spring extending diainin said drum and having one end other. The device could beinclined so that there would not be this engagement between the belt sections, or the incline could be such that the engaging surfaces between belt sections would be increased.

I do not of course desire to be limited to the precise construction and arrangement shown as modifications are no doubt possible which would still come within the scope of the invention.

I claim as follows:

1. A shock absorber tor connection with two relatively movable members, comprising etrally anchored thereto, a friction strap encircling saiddrum adapted to be secured to one of said members, upper and lower rollers journaled on the drum at one side thereof, the. inner end of said strap passing from the drum over said low'er roller and secured to the free end of said,spring,'the outerend of said strap passing from the drum downwardly over said upper roller and adapted for connection with the other member.

2. A shock absorber fonponnection with two relatively movable membe s;'- comprising a*'frictiondrum, a barrel within the drum extending diametrally thereof, a compression spring housed within the. barrel and abutting against one-end there f, a guide surface at 'oneside of said drum, a friction strap connected with the other end of said spring and extending around said guide surface and i i entirely around said drum, said drum being adapted to be secured to one of said movable members and the outer end of said strap being adapted for connection with theother movable member.

3. A shock absorber for vehicles co1nprising an elliptical drum, a, spring positioned Within the drum in the major axis thereof, said drum having an outlet at one end, an upper and a lower roller positioned said outlet. a friction strap secured at its inner end to said sprino and extending outwardly through said outlet and around the lower roller and then encircling the drum and engaging with the upper roller, means for se curing said drum to a support, and means for securing the outer end of said strap to another support.

' 4:. A. shock absorber comprising a drum, a barrel extending diametrally in said drum, a spring housed within said barrel, said drum having an outlet adjacent one end of said barrel, a friction strap secured to said spring and extending through said outlet, a roller adjacent said outlet, said strap passingaround said roller and then entirely around said drum periphery and back across means for securing said drum both said rollers and secured at its outer end to the other'rnovable member.

in witness whereof i hereunto subscribe my name this 18th day of December, A. 1).,

' ALLAN n MQGREGUR. 

